Listeria is a bacteria that can be extremely dangerous if it infects people with weakened immune systems, such as the elderly and children. According to the FDA, symptoms include "high fever, severe headache, stiffness, nausea, abdominal pain and diarrhea."

At this point, there are no reported illnesses associated with any Mann Packing products.

Pre-cut packaged vegetables are one of the food products most susceptible to food poisoning contamination. Attorney Bill Marler, who specializes in foodborne illness cases, says that he avoids pre-cut and pre-washed fruits and vegetables "like the plague."